US technology firms such as Facebook and Twitter have become "command-and-control networks for terrorists" and should co-operate more with intelligence agencies, the head of GCHQ says.

Hmmm i see a slight disparity here with her co-founder on the subject of GCHQ, particularly when he appeared on newsnight and seemed just fine and dandy with them poking around in his phone provided they follow due process DESPITE ALL EVIDENCE TO THE CONTRARY!